... the actual domestic situation for mobile communication. It can isolate GSM/CDMA/DCS/PHS/3G mobile phone ... (5-100 sqm.) radius, making mobile phones can not be dialed out or receive call or message, while ... not interfere with the work of other electronic teaching equipment, and the mobile phone can restore to ... , small in volume and light in weight.Operation can last 3-4 hours, and easy to charge ...